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Supergirl: The Maiden of Might: Action Comics #303: "The Monster from Krypton" & "Supergirl's Big Brother!"
Do you think Doomsday with a kryptonite skeleton and spikes would be the definitive end to Superman? - Quora
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How realistically feasible is the Kryptonian scientist Bertron's technique of creating Doomsday? - Quora
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